Shift Register Random Compensation Eliminates Linear Pattern
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional external compensation methods for OLED display panels result in a linear pattern on the display due to sequential row-by-row compensation, which affects luminance uniformity.
Innovation Solution
A novel shift register design incorporating a compensation selection circuit, storage circuit, blanking input circuit, and shift register circuit that provides a compensation driving signal during the blanking period to sense current across pixels randomly, avoiding sequential row compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sequential row-by-row compensation is used, then compensation can be performed systematically, but linear patterns appear on the display affecting luminance uniformity
Solution Approach 1:
The patent inverts the conventional sequential compensation approach by using a random compensation sequence. Instead of compensating pixels in a fixed row-by-row order that creates visible linear patterns, the patent randomly selects which pixels receive compensation signals during the blanking period, thereby eliminating the systematic linear patterns while maintaining the compensation function.
Solution Approach 2:
The patent introduces dynamic randomness into the compensation process. The compensation sequence is no longer static and predictable but varies randomly for different pixels and frames, making the compensation process adaptive and dynamic rather than following a fixed systematic pattern.
2Reliability
If external compensation method is used, then driving transistor consistency can be improved, but linear patterns are generated on OLED display
Solution Approach 1:
The patent applies the inversion principle by reversing the systematic sequential approach to a random approach. The external compensation method still measures and compensates for driving transistor variations, but the compensation signals are applied in a random sequence rather than a fixed row-by-row pattern, thereby maintaining transistor consistency improvement while eliminating the harmful linear patterns.
Solution Approach 2:
The patent introduces a randomization mechanism as an intermediary between the compensation measurement and the actual compensation signal application. This intermediary layer randomizes the timing and sequence of compensation signals, preventing the direct transmission of systematic patterns from the compensation process to the display output.
3Reliability
If compensation signal is provided during display period, then pixel compensation can be performed, but it interferes with normal display operation
Solution Approach 1:
The patent utilizes periodic action by confining compensation operations to the blanking period between frames, when no display data is being output. During the active display period, the circuit operates normally without compensation interference, while during the periodic blanking period, compensation signals are injected into selected pixels, achieving both compensation and uninterrupted display operation.
Solution Approach 2:
The patent performs compensation actions preliminarily during the blanking period before the next frame's display begins. By completing all compensation operations before the display period starts, the system ensures that compensation is accomplished in advance without interfering with the subsequent normal display operation of the current frame.
Data Source
AI summary
The embodiments of the present disclosure provide a shift register and a driving method thereof, a gate driving circuit, and a display device. The shift register includes a compensation selection circuit, a storage circuit, a blanking input circuit, and a shift register circuit. The compensation selection circuit is configured to provide an input signal to a first node. The storage circuit is configured to store and maintain a voltage difference between a blanking control signal terminal and the first node. The blanking input circuit is configured to provide a blanking input signal to a second node. The shift register circuit is configured to provide a compensation driving signal during a blanking period, and provide a scan driving signal during a display period.